Intel Cannon Lake PCH cAVS | Conexant CX20632 | No sound at HDMI or DisplayPort

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I installed alsa-tools:

pamac install alsa-tools

Then I run:

hdajackretask

There I can overwrite pins.

  1. Choose Intel Kabylake HDMI in the dropdown menu.
  2. Overwrite all pins which are not registered. There is normally a dropdown menu for every Pin. Choose “DisplayPort” or similar.
  3. Click on Apply boot override and type in your user password to confirm.

Now there are 2 files written:

/usr/lib/firmware/hda-jack-retask.fw and /etc/modprobe.d/hda-jack-retask.conf

$ cat /usr/lib/firmware/hda-jack-retask.fw 
[codec]
0x8086280b 0x80860101 2

[pincfg]
0x05 0x18560070
0x06 0x18560070
0x07 0x18560070

$ cat /etc/modprobe.d/hda-jack-retask.conf
# This file was added by the program 'hda-jack-retask'.
# If you want to revert the changes made by this program, you can simply erase this file and reboot your computer.
options snd-hda-intel patch=hda-jack-retask.fw,hda-jack-retask.fw,hda-jack-retask.fw,hda-jack-retask.fw

After a reboot, it works again normally, since the pins are patched.

Guess you could also downgrade HP’s UEFI firmware, but that is also a solution.

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